normal map creation

Anyone have an app to convert a greyscale bump map into a normal map? I used to have one on my machine but it crashed the other day. I need a stand alone app. I know there was a blitz exe that did this but I cannot find it now. Thank you in advance

http://www.soclab.bth.se/practices/orb.html

Deep exploration. 30 day trial at their(Right hempishere) site.

http://www.blitzbasic.com/codearcs/codearcs.php?code=1207

Just what you need in .bb file!

I just downloaded a photoshop plugin again which is very good for this job.
I know that you want a standalone app, but just in case this is all right for you, here it is:
http://developer.nvidia.com/object/nv_texture_tools.html
(The link that says Adobe PhotoShop Normal Map and DDS Authoring Plug-ins)